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https://github.com/protocolbuffers/protobuf-go.git
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27af11f144
Use a non-breaking space instead of two spaces to vary the output. This keeps the mutated version aesthetically similar to the normal one. Change-Id: Ib4ade2795004fe5b30e454e7e533e5a0e3a9ffa2 Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/194157 Reviewed-by: Herbie Ong <herbie@google.com>
48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package errors implements functions to manipulate errors.
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package errors
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import (
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"fmt"
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"google.golang.org/protobuf/internal/detrand"
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)
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// New formats a string according to the format specifier and arguments and
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// returns an error that has a "proto" prefix.
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func New(f string, x ...interface{}) error {
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for i := 0; i < len(x); i++ {
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if e, ok := x[i].(*prefixError); ok {
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x[i] = e.s // avoid "proto: " prefix when chaining
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}
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}
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return &prefixError{s: fmt.Sprintf(f, x...)}
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}
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type prefixError struct{ s string }
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var prefix = func() string {
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// Deliberately introduce instability into the error message string to
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// discourage users from performing error string comparisons.
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if detrand.Bool() {
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return "proto: " // use non-breaking spaces (U+00a0)
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} else {
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return "proto: " // use regular spaces (U+0020)
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}
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}()
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func (e *prefixError) Error() string {
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return prefix + e.s
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}
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func InvalidUTF8(name string) error {
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return New("field %v contains invalid UTF-8", name)
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}
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func RequiredNotSet(name string) error {
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return New("required field %v not set", name)
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}
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